[virt] Adjust spelling of initialise in code and comments

This cl updates the spelling of "initialise" to "initialize" in
the code and comments.

Test: m com.android.virt pvmfw_img
Change-Id: If0ce2a3e8188ddabd4d4e24912eb4973942bd550
diff --git a/vmbase/example/src/layout.rs b/vmbase/example/src/layout.rs
index 2e9d27a..f95958f 100644
--- a/vmbase/example/src/layout.rs
+++ b/vmbase/example/src/layout.rs
@@ -48,7 +48,7 @@
     into_va_range(layout::data_range())
 }
 
-/// Zero-initialised writable data.
+/// Zero-initialized writable data.
 pub fn bss_range() -> Range<VirtualAddress> {
     into_va_range(layout::bss_range())
 }